/*  Starshatter OpenSource Distribution
    Copyright (c) 1997-2004, Destroyer Studios LLC.
    All Rights Reserved.

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    modification, are permitted provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright notice,
      this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright notice,
      this list of conditions and the following disclaimer in the documentation
      and/or other materials provided with the distribution.
    * Neither the name "Destroyer Studios" nor the names of its contributors
      may be used to endorse or promote products derived from this software
      without specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
    AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
    LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
    POSSIBILITY OF SUCH DAMAGE.

    SUBSYSTEM:    Stars.exe
    FILE:         CampaignPlanAssignment.cpp
    AUTHOR:       John DiCamillo


    OVERVIEW
    ========
    CampaignPlanAssignment creates combat assignments for
    assets within each combat zone as the third step in
    force tasking.
*/

#include "MemDebug.h"
#include "CampaignPlanAssignment.h"
#include "Campaign.h"
#include "Combatant.h"
#include "CombatAssignment.h"
#include "CombatGroup.h"
#include "CombatUnit.h"
#include "CombatZone.h"
#include "Mission.h"

// +--------------------------------------------------------------------+

void
CampaignPlanAssignment::ExecFrame()
{
    if (campaign && campaign->IsActive()) {
        // once every few minutes is plenty:
        if (Campaign::Stardate() - exec_time < 300)
        return;

        ListIter<Combatant>  iter = campaign->GetCombatants();
        while (++iter) {
            ProcessCombatant(iter.value());
        }

        exec_time = Campaign::Stardate();
    }
}

// +--------------------------------------------------------------------+

void
CampaignPlanAssignment::ProcessCombatant(Combatant* c)
{
    CombatGroup* force = c->GetForce();
    if (force) {
        force->CalcValue();
        force->ClearAssignments();
    }

    ListIter<CombatZone> zone = campaign->GetZones();
    while (++zone) {
        ProcessZone(c, zone.value());
    }
}

// +--------------------------------------------------------------------+

void
CampaignPlanAssignment::BuildZoneList(CombatGroup* g, CombatZone* zone, List<CombatGroup>& groups)
{
    if (!g)
    return;

    if (g->GetAssignedZone() == zone)
    groups.append(g);

    ListIter<CombatGroup> iter = g->GetComponents();
    while (++iter)
    BuildZoneList(iter.value(), zone, groups);
}

// +--------------------------------------------------------------------+

void
CampaignPlanAssignment::BuildAssetList(const int*         pref,
List<CombatGroup>& groups,
List<CombatGroup>& assets)
{
    if (!pref)
    return;

    while (*pref) {
        ListIter<CombatGroup> g = groups;
        while (++g) {
            if (g->Type() == *pref && g->CountUnits() > 0)
            assets.append(g.value());
        }

        pref++;
    }
}

// +--------------------------------------------------------------------+

void
CampaignPlanAssignment::ProcessZone(Combatant* c, CombatZone* zone)
{
    List<CombatGroup> groups;
    BuildZoneList(c->GetForce(), zone, groups);

    ZoneForce* force = zone->FindForce(c->GetIFF());

    // defensive assignments:
    ListIter<CombatGroup> def = force->GetDefendList();
    while (++def) {
        List<CombatGroup> assets;
        BuildAssetList(CombatGroup::PreferredDefender(def->Type()), groups, assets);

        ListIter<CombatGroup> g = assets;
        while (++g) {
            CombatAssignment* a = new(__FILE__,__LINE__)
            CombatAssignment(Mission::DEFEND,
            def.value(),
            g.value());

            if (a)
            g->GetAssignments().append(a);
        }
    }

    // offensive assignments:
    ListIter<CombatGroup> tgt = force->GetTargetList();
    while (++tgt) {
        CombatGroup* target = tgt.value();

        List<CombatGroup> assets;
        BuildAssetList(CombatGroup::PreferredAttacker(tgt->Type()), groups, assets);

        ListIter<CombatGroup> g = assets;
        while (++g) {
            CombatGroup* asset = g.value();
            int          mtype = Mission::ASSAULT;

            if (target->IsStrikeTarget())
            mtype = Mission::STRIKE;

            else if (target->IsFighterGroup())
            mtype = Mission::SWEEP;

            else if (target->Type() == CombatGroup::LCA_SQUADRON)
            mtype = Mission::INTERCEPT;

            CombatAssignment* a = new(__FILE__,__LINE__)
            CombatAssignment(mtype, target, asset);

            if (a)
            g->GetAssignments().append(a);
        }
    }
}